138274647 has 16 divisors (see below), whose sum is σ = 221794560. Its totient is φ = 74855232.

The previous prime is 138274637. The next prime is 138274687. The reversal of 138274647 is 746472831.

It is not a de Polignac number, because 138274647 - 2¹⁰ = 138273623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138274599 and 138274608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138274607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172878 + ... + 173675.

It is an arithmetic number, because the mean of its divisors is an integer number (13862160).

Almost surely, 2^138274647 is an apocalyptic number.

138274647 is a deficient number, since it is larger than the sum of its proper divisors (83519913).

138274647 is a wasteful number, since it uses less digits than its factorization.

138274647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346582.

The product of its digits is 225792, while the sum is 42.

The square root of 138274647 is about 11759.0240666477. The cubic root of 138274647 is about 517.1075191629.

The spelling of 138274647 in words is "one hundred thirty-eight million, two hundred seventy-four thousand, six hundred forty-seven".